Answer:

moa

Answer	Crossword Clue
MOA	Bygone bird
MOA	Extinct New Zealand bird
MOA	Extinct ostrich

MOA	Flightless New Zealander
MOA	Extinct bird
MOA	Extinct ostrich relative
MOA	Kiwi's extinct relative
MOA	New Zealand ratite
MOA	Ostrich's cousin
MOA	Old bird of New Zealand
MOA	Extinct giant bird of New Zealand

MOA	Extinct kin to an ostrich
MOA	"Dinornis" of yore
MOA	Kiwi relative
MOA	Extinct flightless bird
MOA	Extinct kiwi relative
MOA	Emu's extinct relative
MOA	Wingless bird
MOA	Extinct kiwi cousin

MOA	Extinct ostrich-like bird
MOA	Emu's extinct kin
MOA	Kiwi's late kin
MOA	Extinct New Zealander
MOA	Extinct bird of New Zealand
MOA	Extinct relative of the kiwi
MOA	Bygone ratite
MOA	Bygone New Zealander

MOA	"There ain't no ..." (bygone-bird lament)
MOA	Bird now extinct
MOA	Extinct herbivore of New Zealand
MOA	Kiwi's kin
MOA	Flightless bird
MOA	Extinct emu-like bird
MOA	Bird that grew as tall as 12 feet
MOA	Minn. shopping mecca

MOA	Extinct emu relative
MOA	Extinct ostrichlike bird
MOA	Wingless extinct bird
MOA	"Dinornis robustus"
MOA	Kiwi's erstwhile kin